Paper-pulp beater.



R. F. LACHMANN.

PAPER PULP HEATER.

APPLICATION FILED MAY16, 1914.

Patented Nov. 16, 1915 2 SHEETS-SHEET l..

fw nk-m ks H Patented Nov. 16, 1915.

2 SHEETS-SHEET 2.

R. F. LACHMANN.

PAPER PULP BEATER. 1 APPLICATION FILED MAY 16. 1914.

Fig.5.

x/vi'br esses.

ROBERT F. LACHMANN, OF ERIE, PENNSYLVANIA.

PAPER-PULP BEATER.

Specification of Letters Patent.

Patented Nov. 16, 1915.

Application filed May 16, 1914. Serial No. 839,058.

outside wall A, and the middlewall A, a

T all whom it may concern Be it known that I, ROBERT F. LACH- MANN, a citizen of the German Empire, re-

siding at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in Paper-Pulp Beaters; and I do hereby declare the following to a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming part of this specification.

My invention relates to pulp beaters for paper mills, of the type in which the mass of pulp circulates around a partition wall, and during such circulation is subject to the action of a beater-cylinder. In this type of beater as commonly constructed, the mass of pulp is caused to circulate by the continuous action of the beater-cylinder, which, in addition to its grinding function, pushes the pulp, which passes thereunder, away from it, thereby forcing the mass to circulate. During this operation, the rear side of the beater-cylinder is in continuous contact with the mass of pulp slightly above the level of its axis, which, owing to its pressure against the cylinder, causes great loss of power.

The object of my invention, therefore, is to so construct the beater-vat as to relieve the back pressure against the cylinder, and increase the speed of the circulation .of the mass of pulp in the vat.

The features of my invention will appear hereinafter in the specification and claims, and are illustrated in the accompanying drawings, in which Figure 1, is a plan view of a. paper-pulp beater constructed according to my invention. Fig. 2, is a longitudinal section of the same on the line m.r looking in the direction of the arrow in Fig. 1. Fig. 3, is a transverse section of the same on the line y-y, looking in the direction of the arrow in Fig. 2. Fig. 4, is an inside plan view of the sliding shaft-gate used in carrying out my 1nvention. Fig. 5, is a top or plan view of the same. Fig. 6, is a vertical central section of the same.

In these drawings A, indicates the outside wall of a beater-vat, and A, indicates the middle or division wall thereof. These walls and the bottom of the vat are preferably constructed of concrete. Between the cylinder B, is supported upon a shaft B, in the usual manner, said shaft B, being in openings at a a, in the walls A and A. The beater-cylinder B, is provided with bars 6, which cooperate with bars 0, in a heaterplate C, supported in the bottom of the vat, underneath the cylinder B. Commencing at the rear side of the beater-plate C, I build up the bottom of the vat in the form of a wall, D, having the face thereof adjacent to the cylinder, curved on substantially the same radius as the cylinder B, but spaced away therefrom, to a point slightly below the axis of said cylinder, and therefrom continuing upward in a parabolic curve at, away from said cylinder to a point 03, above the axis thereof, from which point said wall D, descends to a point (1 substantially one-half of the depth of the vat-wall A, from which point the bottom of the vat continues on a decline toward the opposite end of the vat, as shown by the broken line E, in Fig. 2, and broken lines E, in Fig. 3, until the lowest or deepest point E of the vat, is reached;

from which point the bottom commences to ascend but not on so great an inclination, to the beater-plate C. The bottom of the vat at its highest portion is preferably given a trough-shape, thickening the lower portion of the dividing wall A, at F, as shown in Figs. 1 and 3, for the purpose of forcing the mass of pulp against the outside wall A, said thickening tapering out to nothing, at the deepest part of the vat. I also preferably .fill in the corner between the outside wall A, and the high portion of the vat bottom, as at F, in Figs. 1 and 3. Owing'to the raising of the bottom of the vat so as to secure the declining surface from the point (P, to the lowest point E the upper surface of the returning stream of pulp is raised sufficiently to flow over the shaft B, and therefore will run out through theshaft openings or, in the walls A, and A. It is understood, of course, that the cylinder B, and shaft B, must be provided with vertical adjustment, away fromand toward the beater-plate C.

To prevent the pulp from flowing through the shaft openings at, in the walls A, and A, I secure slide-ways G G, in the walls A and A, on each side of said openings or (see Figs. 4, 5 and 6) which have grooves g, therein, in which I place a plate or gate H, which is preferably composed of two parts,

with semi-circular recesses adapted to embrace the shaft B, said two parts being secured together by means of bolts, 9. Between the lower ends of the slide-way G, there is a plate G, which is provided with small grooves 9 which act as packing means when the gate H, contacts with the plate G, to prevent water from flowing therebetween. The parts of the gate H, are provided with flanges H, to give a more ex- ,.tensive bearing on the shaft B, and I provide small grooves h, in said semi-circular recesses, which act as packing means when the gate H, is in place on the shaft B. It is obvious that this sliding-gate will prevent the flow of water and pulp through the openings a, and at the same time will permit of a vertical movement of the shaft B, in said openings.

In operation,the cylinder B, revolves in the direction of the arrow in Fig. 2, and draws the pulp thereunder, and carries it upward and along the curved surface of the wall D, and over the point 01, thereof, from which point the pulp travels downward around the division wall A, as shown by the arrows in Fig. 1, again to the beater-cylinder, the force of gravitation alone causing it to travel back to the cylinder, after it has passed over the wall D, so that there is substantially no back-pressure exerted upon the cylinder B.

In Fig. 3, I show the apex d, of the wall D as being depressed in the middle portion thereof, which materially reduces the friction of the pulp against the walls A and A, at that point, and aids in the rapid flow of the pulp over the apex of the wall D.

By means of my invention hereinbefore described, the speed of the circulation of the pulp is materially increased so that much less time is necessary in beating a vat of pulp.

Having thus shown and described my invention so as to enable others to construct and utilize the same, what I claim as new and desire to secure by Letters-Patent, is 2- 1. In a back-wall of a paper-pulp. beater, a concavo-convex up-flow face, a concave wall the edge of which is depressed at the central portion, substantially as set forth.

3. The .combination in a paper-pulp beater, of a vat, a division wall therein, a heater cylinder between the outside wall and said division wall, a transverse 'backwall behind said cylinder, and a vertically concaved and longitudinally convex surface on said division wall merging into a vertical plane in the direction of the returnflow of pulp along the side of the division wall opposite said cylinder, substantially as set forth.

4. In a paper-pulp beater, the combination of a vat having shaft openings in the walls thereof, a shaft in said'openings, vertical slide-ways secured at each side of said open.-

ings, a transverse plate secured between the lower ends of said slide-ways under said openings, a sliding gate slidably mounted in said slide ways and embracing said shaft, i

the near side of the lower end of said gate contacting against said transverse plate, and packing means secured in the shaft opening in said gate and contacting with said shaft, substantially as and for the purpose set forth.

In testimony whereof I affix my signature, in presence of two witnesses.

ROBERT F. LACHMANN. 

